I've had a reasonable look thru the forum before posting this but forgive me if I missed something.
My old migmate was working OK until suddenly no speed control!! Wire feed is working but only at maximum speed, changing power settings changes the speed to some extent because of the varying torch voltage but the speed control board is having no effect.
Has someone out there got the fault diagnosis info for these? I'm thinking the TIP35 transistor must be good but maybe the protection diode across its collector and emittor has failed, if it went short circuit then there would be no speed control. Main speed control pot and trimmer appear to be ok, but checking these in circuit can be unreliable.
Any thoughts?
Dave
My old migmate was working OK until suddenly no speed control!! Wire feed is working but only at maximum speed, changing power settings changes the speed to some extent because of the varying torch voltage but the speed control board is having no effect.
Has someone out there got the fault diagnosis info for these? I'm thinking the TIP35 transistor must be good but maybe the protection diode across its collector and emittor has failed, if it went short circuit then there would be no speed control. Main speed control pot and trimmer appear to be ok, but checking these in circuit can be unreliable.
Any thoughts?
Dave